package me.shibor.study.servlet.loginDemo;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

@WebFilter(urlPatterns = { "/*" })
public class LoginFilter implements Filter {

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		System.out.println("验证是否登录");

		HttpServletRequest httpRequst = (HttpServletRequest) request;
		HttpSession session = httpRequst.getSession();
		String user = (String) session.getAttribute("user");

		String requestURI = httpRequst.getRequestURI();
		if (requestURI.contains("/LoginServlet")) {
			chain.doFilter(request, response);
		} else if (user == null) {
			request.getRequestDispatcher("/login/login.jsp").forward(request, response);
		} else {
			chain.doFilter(request, response);
		}

	}

	@Override
	public void destroy() {

	}

}
